File: issue-25439.rs

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rustc 1.88.0%2Bdfsg1-1
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struct Helper<'a, F: 'a>(&'a F);

fn fix<F>(f: F) -> i32 where F: Fn(Helper<F>, i32) -> i32 {
    f(Helper(&f), 8)
}

fn main() {
    fix(|_, x| x); //~ ERROR closure/coroutine type that references itself [E0644]
}